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On a certain method of solution of equations with simple characteristics. (Russian) Zbl 0472.35031

MSC:
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
35G05 Linear higher-order PDEs
78A45 Diffraction, scattering
35A05 General existence and uniqueness theorems (PDE) (MSC2000)
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